Abstract Scope |
When fabricating overhang structures with the laser powder bed fusion (L-PBF) process, the recoater blade is prone to stoppage during printing if the overhang tip significantly deforms, which is often referred to as the recoater crash. In the present work, the modified inherent strain (MIS) method, as a fast modeling approach, is implemented to predict the distortion of a part with overhangs during printing. Through experimental measurement and simulation results, we investigate the relationships between multiple geometrical parameters and the height of the part immediately before a recoater crash. After that, the critical criterion is found to predict the recoater crash. The proposed criterion can be applied in the design stage of a part to reduce the possibility of a recoater crash, thus saving cost and increasing manufacturing efficiency. |